I want to try mandarin orange picking around Izu.

I am thinking of an one-night trip to Izu from Tokyo. I'd like to try mandarin orange picking with my child, so please tell me any inns close to a farm where we can experience mandarin orange picking. We will move around by train. I am thinking of a budget of 30,000 yen for a family of three with a child.

An integrated resort with a fixed room-only price at anytime

It was 4,000 yen when we stayed long time ago, and is still 6600 yen. No shortage of bus services to Shuzenji Station. You can fully enjoy at a reasonable budget if your schedule is like this: Try mandarin orange picking and check-in after dinner on the first day. On the second day, go back to Shuzenji Station by bus after totally enjoying and have dinner in the "Odoriko (Super View Odoriko?)" train. I don’t know what your kid likes, but it is an integrated resort where "anything goes".

Ito Onsen Hatoya Hotel

A famous hotel in Izu

This long-established hotel is also famous with its TV commercials.
The open-air baths are big and there is a huge water tank where turtles peek their faces out of the water. Many families were bathing when I was there, and children were all happy. It was also good that it was close from Ito Station, the nearest station of mandarin orange picking.

A big room!

A recommended for mandarin orange picking is farms in the vicinity of Usami Station. Then a hotel in Ito would be convenient.
This hotel was originally built as a condominium and is not barrier-free (the floor is not flat), but the room is biggest in Izu though a drawback is the corridor is exposed to the outside air. It would fit your budget if staying on weekdays.
There are some cute rabbits and squirrels, and you can feed the rabbits if you want.
Only Kikuma-en that this hotel is affiliated with has free pick-up services from Usami Station. This year's oranges were sweet.

Atagawa Onsen Resort Pension Beagle

Pick-up services at a station

An American House situated on a hill of the villa district. A natural hot spring open-air bath, and Western home cooking and Japanese meal mainly using fresh seafood for dinner as well as freshly baked bread for breakfast are attractive. A recommended mandarin orange picking farm is Hinokuchi-en. It is all right without a car because both the farm and B&B have pick-up services to a station.